Door for bomb shelter



March 3, 1964 M. M. ROSENFELD 3,122,934

DOOR FOR BOMB SHELTER Filed Nov. 24, 1961 FIG! 3 FIGZ INVENTOR.

MORTON M. ROSENFELD BY Mum ATTORNEY United States Patent 3,122,984 DGGR FGR new SHELTER Morton M. Rosenfeld, 271 Madison Ave., Mount Vernon, FLY. Filed Nov. 24, 1961, Ser. No. 154,543 4 Claims. (Cl. 98-87) This invention relates to a door for a bomb shelter, and more particularly, to a door having replaceable filters mounted therein and means for accommodating replaced filters which have been exposed to radioactive dust In bomb shelters, air-raid shelters, and the like there is a need for a door which can be part of the ventilation system for the bomb shelter, etc. That is, the door should be provided with an opening having replaceable filters therein so that filtered air may be admitted to the interior of the bomb shelter. In order to provide filtered air over an extended period of time, the filters will have to be removed and stored without the persons disposed within the interior of the bomb shelter being subjected to the radioactive dust accumulated on the filters.

The door structure of the present invention has the necessary shielding qualities and includes a chamber for receiving replaced filters which have accumulated radioactive dust thereon. In accordance with the present invention, a door is provided with an opening therein. A filter is replaceably mounted within the opening in the door. A casing is mounted on the door around the opening in the door. Vents are provided in the casing so that air may enter the same and pass through the filter. When a filter is replaced, it is retained within the casing.

It is an object of the present invention to provide a novel door structure.

It is another object of the present invention to provide a novel door for a bomb shelter or the like.

It is another object of the present invention to provide a novel door having a filtered opening therein and a casing for receiving replaced filters.

It is another object of the present invention to provide a novel door adapted to have a portion of a ventilation system therein for providing filtered air to an enclosure.

Other objects will appear hereinafter.

For the purpose of illustrating the invention there is shown in the drawings forms which are presently preferred; it being understood, however, that this invention is not limited to the precise arrangements and instrumentalities shown.

FIGURE 1 is an elevation view of the outer surface of the door of the present invention.

FIGURE 2 is an elevation view of the inner surface of the door of the present invention.

FIGURE 3 is a sectional view taken along the lines 3-3 in FIGURE 1.

FIGURE 4 is an enlarged sectional view taken along the lines 44 in FIGURE 3.

FIGURE 5 is a partial sectional view of a door according to another embodiment of the present invention.

Referring to the drawing in detail, wherein like numerals indicate like elements, there is shown in FIGURE 1, a bomb shelter designated generally as ll). The bomb shelter it is provided with a floor 12 on which walls 14 me supported in an upright position. It will be appreciated that the bomb shelter 19 also includes a ceiling and other conventional structure.

The wall 14, as shown more clearly in FIGURES 1 and 2, is provided with a doorway 16. A door frame 18 is disposed on the inner surface of the wall 14. As shown more clearly in FIGURE 3, the door frame 18 pro jects inwardly from the doorway 16 thereby restricting the opening of the doorway 16. The door frame 18 is a separate element as illustrated in the drawing. However,

it will be appreciated that the door frame 18 could be integral with the wall 14 if desired. A deformable seal 20, such as an O-ring, is provided on one surface of the door frame 18.

A door designated generally as 22 is pivotably mounted in the doorway 16 by means of hinges 24 and 26. As shown more clearly in FIGURE 3, the door 22 is provided with a concrete core 28. The core 28 is encased within metal layers 30 and 32 which are disposed on opposite sides thereof. The layers 30 and 32 may be steelplate, lead, etc.

The door 22 is provided with an opening 34 extending therethrough. A filter 36 is snap-fitted within the opening 34. It will be noted that the filter 36 lies in the same plane as the door 22.

A casing 38 is provided to receive replaced filters. The casing 38 is U-shaped in transverse cross section. The open side of the casing 38 is juxtaposed to and fixedly secured to the metal layer 32. As shown more clearly in FIGURE 1, the casing 33 is provided with a section 46 which overlies the opening 34, a section 42 for receiving and retaining replaced filters, and a section 44 which provides communication between sections 40 and 42.

As shown more clearly in FIGURE 3, the casing 38 is provided with a pivotably mounted bottom wall 46. The section 44 is provided with a plurality of vent holes 48 on opposite sides thereof. The vent holes 48 provide communication between the atmosphere and the interior of the casing 38. As shown more clearly in FIGURE 4, a plurality of baffies 50 are provided within the casing section it). The bafiles 50 are provided with angularly disposed ends 52 so that incoming air assumes the flow pattern illustrated by the arrows in FIGURE 4.

The casing section 38 may be partially filled with a liquid such as water. Replaced filters will be immersed within the water to prevent the incoming air from causing circulation of dust which has accumulated on replaced filters, which filters have been accumulated within the casing 38. Also, the baffles 50 will cause the air flow pattern to be directed toward the surface of the liquid in the casing 33 thereby causing heavy particles within the air to be directed toward the surface of the liquid.

A filter 3% may be readily replaced from within the bomb shelter 10 by placing a new filter within the opening 34-. By applying pressure against the new filter, the old filter will be forced into the casing 38 wherein it will drop due to gravity into the section 42.

As shown in the cross sectional view in FIGURE 3, the edge of the filter 36 is drawn for rubber. The edge of the filter being rubber, it is easy to understand that the filter 36 can be pressed into place by the user of the shelter. When it is desired to remove the filter, it can be pushed forward into the casing 38. The rubber frame allows the user to simply accomplish this purpose.

Thus, it will be seen that the bomb shelter 1% is provided with a novel door structure which enables filtered air to be transmitted into the interior of the bomb shelter. At the same time, the door for the bomb shelter is provided with a means for receiving and retaining replaced filters.

There is shown in FIGURE 5 a portion of a door designated generally as 22'. The door 22 may be utilized in the bomb shelter 10 in place of the door 22. The door 22' is identical with the door 22 except that the door 22' is hollow. That is, the door 22' is provided with a chamber 54 between the metal layers 30 and 32. The chamber 54- may be filled with any one of a wide variety of shielding materials including powdered materials, liquids, and solid materials.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof and, accordingly, reference should be made to append claims, rather than to the foregoing specification as indicating the scope of the invention.

I claim:

1. Apparatus comprising a wall partially defining an enclosure, said wall having a doorway therein, a door, mounting means mounting said door in said doorway for movement between an open and a closed disposition,.said door having an opening therethrough, a filter in said opening, a casing on said door for receiving saidfilter when said filter has become contaminated and is replaced by a clean filter, said casing overlying said opening, said casing having a longitudinally extending front wall spaced from said door, said casing having top, bottom and side walls extending from said front wall to said door, vents in the side walls of said casing spaced below said door opening, said vents providing communication between the atmosphere and the interior .of said casing, said casing providing a chamber for receiving said filter spaced below said vents.

2. Apparatus in accordance with claim 1 including baffies within said casing adjacent said vents, said bafiles being arranged with respect to said vents so as to require air flowing through said vents to flow through a circuitous path.

3. Apparatus in accordance with claim 1 wherein said chamber portion of said casing is filled with a liquid, the surface of said liquid being below said vents.

4. Apparatus in accordance with claim 1 wherein said casing bottom wall is movable, said bottom wall being movable to .a position wherein a filter within said casing may be removed therefrom.

References Cited in the file of this patent UNITED STATES PATENTS 2,406,278 Worth Aug. 20, 1946 2,704,504 \Vilkening Mar. 22, 1955 2,798,422 Bourque July'9, 1957 

1. APPARATUS COMPRISING A WALL PARTIALLY DEFINING AN ENCLOSURE, SAID WALL HAVING A DOORWAY THEREIN, A DOOR, MOUNTING MEANS MOUNTING SAID DOOR IN SAID DOORWAY FOR MOVEMENT BETWEEN AN OPEN AND A CLOSED DISPOSITION, SAID DOOR HAVING AN OPENING THERETHROUGH, A FILTER IN SAID OPENING, A CASING ON SAID DOOR FOR RECEIVING SAID FILTER WHEN SAID FILTER HAS BECOME CONTAMINATED AND IS REPLACED BY A CLEAN FILTER, SAID CASING OVERLYING SAID OPENING, SAID CASING HAVING A LONGITUDINALLY EXTENDING FRONT WALL SPACED FROM SAID DOOR, SAID CASING HAVING TOP, BOTTOM AND SIDE WALLS EXTENDING FROM SAID FRONT WALL TO SAID DOOR, VENTS IN THE SIDE WALLS OF SAID CASING SPACED BELOW SAID DOOR OPENING, SAID VENTS PROVIDING COMMUNICATION BETWEEN THE ATMOSPHERE AND THE INTERIOR OF SAID CASING, SAID CASING PROVIDING A CHAMBER FOR RECEIVING SAID FILTER SPACED BELOW SAID VENTS. 